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 * Copyright (c) 1998 World Wide Web Consortium, (Massachusetts Institute of
 * Technology, Institut National de Recherche en Informatique et en
 * Automatique, Keio University).
 * All Rights Reserved. http://www.w3.org/Consortium/Legal/

package org.w3c.dom;

 * <code>DocumentFragment</code> is a "lightweight" or "minimal" 
 * <code>Document</code> object. It is very common to want to be able to 
 * extract a portion of a document's tree or to create a new fragment of a 
 * document. Imagine implementing a user command like cut or rearranging a 
 * document by moving fragments around. It is desirable to have an object 
 * which can hold such fragments and it is quite natural to use a Node for 
 * this purpose. While it is true that a <code>Document</code> object could 
 * fulfil this role,  a <code>Document</code> object can potentially be a 
 * heavyweight  object, depending on the underlying implementation. What is 
 * really needed for this is a very lightweight object.  
 * <code>DocumentFragment</code> is such an object.
 * <p>Furthermore, various operations -- such as inserting nodes as children 
 * of another <code>Node</code> -- may take <code>DocumentFragment</code> 
 * objects as arguments;  this results in all the child nodes of the 
 * <code>DocumentFragment</code>  being moved to the child list of this node.
 * <p>The children of a <code>DocumentFragment</code> node are zero or more 
 * nodes representing the tops of any sub-trees defining the structure of the 
 * document. <code>DocumentFragment</code> nodes do not need to be 
 * well-formed XML documents (although they do need to follow the rules 
 * imposed upon well-formed XML parsed entities, which can have multiple top 
 * nodes).  For example, a <code>DocumentFragment</code> might have only one 
 * child and that child node could be a <code>Text</code> node. Such a 
 * structure model  represents neither an HTML document nor a well-formed XML 
 * document.  
 * <p>When a <code>DocumentFragment</code> is inserted into a  
 * <code>Document</code> (or indeed any other <code>Node</code> that may take 
 * children) the children of the <code>DocumentFragment</code> and not the 
 * <code>DocumentFragment</code>  itself are inserted into the 
 * <code>Node</code>. This makes the <code>DocumentFragment</code> very 
 * useful when the user wishes to create nodes that are siblings; the 
 * <code>DocumentFragment</code> acts as the parent of these nodes so that the
 *  user can use the standard methods from the <code>Node</code>  interface, 
 * such as <code>insertBefore()</code> and  <code>appendChild()</code>.  
00045 public interface DocumentFragment extends Node {

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